Nail the "cool vs. warm" thing, once and for all: There are seemingly endless ways to determine whether your skin has cool or warm undertones (like that "green veins, blue veins" trick, which we still can't figure out). Luckily, Sally Hansen nail ambassador Tracylee has a much easier method figured out. "Lighter skin has cool undertones," she says. "Darker skin has warm."

After that, it's all about blue-based or orange-y reds: Light skin with cool undertones looks best in blue-based reds. (We love Sally Hansen Complete Salon Manicure in Red My Lips.) Tomato-y shades, which are sprinkled with a dash of yellow, are most flattering on darker skin with warm undertones.

Keep red nails short and well-shaped: Yes, loooong red "stiletto" talons are having a moment, but brides-to-be should keep it classy. "It's best to follow the natural nail shape, which is oval or rounded," says Tracylee. "And the length that is most flattering for red is just past the fingertip. That gives nails a longer, sleeker look."